Tetrabutylammonium Fluoride → 2,2,2-Trifluoro-1-(9-((4-(2-hydroxyethyl)thiophen-2-yl)methyl)-1-oxa-4,9-diazaspiro[5.5]undecan-4-yl)ethanone

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Reaction Steps

TBAF (1M in THF, 2.96 mL) was added to a stirred solution of 1-(9-((4-(2-(tert-butyldimethylsilyloxy)ethyl)thiophen-2-yl)methyl)-1-oxa-4,9-diazaspiro[5.5]undecan-4-yl)-2,2,2-trifluoroethanone (Example 43, step a) (1.500 g, 2.96 mmol) in THF (5 mL). After 1 h, the solution was evaporated to gum. Purification by silica gel chromatography eluting with ethyl acetate:triethylamine, 10:1 gave the subtitled compound as a gum. Yield 0.25 g.

Provenance & Evidence